/*
 * Copyright (C) 2000-2008 Jens Nixdorf and various contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software, its documentation and marketing & publicity
 * materials, and acknowledgment shall be given in the documentation, materials
 * and software packages that this Software was used.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.mopore.jat.plugin;

import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mopore.jat.gui.IThemeChangeListener;
import org.mopore.jat.gui.Theme;

public class ThemeChangeDelegator implements IThemeChangeListener{

private final Log log = LogFactory.getLog(getClass().getName());
	
	private List<IThemeChangeListener> themeListenerList;
	
	
	public ThemeChangeDelegator(){
		
		this.themeListenerList = new LinkedList<IThemeChangeListener>();
	}
	
	public void addListener( IThemeChangeListener themeListener ) {
		themeListenerList.add( themeListener );
	}
	
	
	public void onThemeChanged(Theme newTheme) {
		log.debug( "onThemeChanged" );
		
		ListIterator<IThemeChangeListener> listIterator = 
			themeListenerList.listIterator();
		
		while ( listIterator.hasNext() ) {
			IThemeChangeListener listener = listIterator.next();
			try {
				listener.onThemeChanged( newTheme );
			} catch (Exception e) {
				log.error( "an error occured.", e );
				listIterator.remove();
			}
		}
	}

}
